The vapor leaving the top of a distillation column goes to a condenser in which either total or partial condensation takes place. If a total condenser is used, a portion of the condensate is returned to the top of the column as reflux and the remaining liquid is taken off as the overhead product (or distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the uncondensed vapor is taken off as the overhead product. The overhead product from an n-butane-n-pentane distillation column is 96 mole% butane. The temperature of the cooling fluid limits the condenser temperature to 40 °C or higher. REFLUX DRUM a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate as a partial condenser (i.e., at which it can produce liquid for reflux) b) the production rate of overhead product is 60 kmol/h, and the mole ratio of reflux to overhead product is 1.5: 1. Calculate the molar flow rates and compositions of the reflux stream and the vapor feed to the condenser. Vapor from top of column Reflux (liquid) PARTIAL CONDENSER Cooling fluid Overhead product (vapor)
The vapor leaving the top of a distillation column goes to a condenser in which either total or partial condensation takes place. If a total condenser is used, a portion of the condensate is returned to the top of the column as reflux and the remaining liquid is taken off as the overhead product (or distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the uncondensed vapor is taken off as the overhead product. The overhead product from an n-butane-n-pentane distillation column is 96 mole% butane. The temperature of the cooling fluid limits the condenser temperature to 40 °C or higher. REFLUX DRUM a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate as a partial condenser (i.e., at which it can produce liquid for reflux) b) the production rate of overhead product is 60 kmol/h, and the mole ratio of reflux to overhead product is 1.5: 1. Calculate the molar flow rates and compositions of the reflux stream and the vapor feed to the condenser. Vapor from top of column Reflux (liquid) PARTIAL CONDENSER Cooling fluid Overhead product (vapor)
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:The vapor leaving the top of a distillation
column goes to a condenser in which either
total or partial condensation takes place. If
a total condenser is used, a portion of the
condensate is returned to the top of the
column as reflux and the remaining liquid
is taken off as the overhead product (or
distillate). If a partial condenser is used, the liquid condensate is returned as reflux and the
uncondensed vapor is taken off as the overhead product. The overhead product from an
n-butane-n-pentane distillation column is 96 mole% butane. The temperature of the
cooling fluid limits the condenser temperature to 40 °C or higher.
REFLUX DRUM
a) Using Raoult's law, estimate the minimum pressure at which the condenser can operate
as a partial condenser (i.e., at which it can produce liquid for reflux)
b) the production rate of overhead product is 60 kmol/h, and the mole ratio of reflux to
overhead product is 1.5: 1. Calculate the molar flow rates and compositions of the reflux
stream and the vapor feed to the condenser.
Vapor from
top of column
Reflux
(liquid)
PARTIAL
CONDENSER
Cooling fluid
Overhead
product (vapor)
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